I think that despite some of it's similarities with past mecha series, this series is truely remarkable. The fact that it is probably going to remind alot of anime fans of Neon Genesis Evangelion still remains, however there are many differences between the two series.
The storyline is centered around an ongoing battle between Aliens and Humanity. The heavily Military influenced Galactic University has taken parts from the aliens to develop the earths counter-weapon. The funny thing is that our the earth's counter weapon is sort of a Frankenstien made up of recovered alien parts. When the experiments to wake up this re-developed alien (later to be known as "Frank" or the Extra 1) go terribly wrong the our main character, Takuto Kaneshiro, of the series looses someone very close to him, Maki Agata who was invloved with this experiment.
Takuto Kaneshiro, later to be known as Lieutenant Ryu Soma, decides to join an organization called Funeral where the Extra 1 or Frank has been taken to battle the aliens. The series revolves around Ryu Soma and his hatred towards the Extra 1 for taking Maki's life. At the funeral base the other key characters are introduced as a plot begins to develop.
I have watched this whole series and I have to say that once you get through the first couple volumes of the series, the story get much better. Trust me, the whole series is not as borring as the first couple episodes of this series may seem. There is actually more to the plot than just a silly little Frankenstien take on a Mecha series.
RahXephon, Vandread, Escaflowne, and the ever soooo popular Neon Genesis Evangelion (If you havn't seen it yet but who hasn't seen Evangelion!!).
DEFFINATLY CHECK THIS ONE OUT!! :)